[C# & WPF] Clipboard Monitor

Salut à tous,
j'ai modifié le code comme ceci mais ca ne fonctionne pas, une idée ?
Code:
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   [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
    public class ClipboardMonitor : IDisposable
    {
        #region P/Invoke
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);
        [DllImport("User32.dll", CharSet = CharSet.Auto)]
        private static extern bool ChangeClipboardChain(IntPtr hWndRemove, IntPtr hWndNewNext);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);
        #endregion
        #region Constante
        private const int WM_DRAWCLIPBOARD = 0x0308;
        private const int WM_CHANGECBCHAIN = 0x030D;
        #endregion
        #region Private Fields
        private IntPtr Handle = IntPtr.Zero;
        private IntPtr ClipboardViewerNext = IntPtr.Zero;
        private Boolean Enabled = false;
        #endregion
        #region Properties
 
        public Boolean IsEnabled
        {
            get
            {
                return (this.Enabled);
            }
            set
            {
                this.Enabled = value;
            }
        }
 
        #endregion
        #region Event 
        public event ClipboardChangedEventHandler ClipboardChanged = null;
        #endregion
        #region Methods
        public void Start()
        {
            this.Enabled = true;
        }
        public void Stop()
        {
            this.Enabled = false;
        }
 
        public bool FilterMessage(ref Message m)
        {
            if (!this.Enabled)
            {
                return false;
            }
            switch (m.Msg)
            {
                case WM_DRAWCLIPBOARD:
                    if (this.ClipboardChanged != null)
                    {
                        try
                        {
                            System.Windows.IDataObject IData = System.Windows.Clipboard.GetDataObject();
                            this.ClipboardChanged(this, new ClipboardChangedEventArgs(IData));
                        }
                        catch
                        {
                        }
                    }
                    SendMessage(this.ClipboardViewerNext, m.Msg, m.WParam, m.LParam);
                    return (true);
                case WM_CHANGECBCHAIN:
                    if (m.WParam == this.ClipboardViewerNext)
                    {
                        this.ClipboardViewerNext = m.LParam;
                    }
                    else
                    {
                        SendMessage(this.ClipboardViewerNext, m.Msg, m.WParam, m.LParam);
                    }
                    return (true);
 
                default:
                    return (false);
            }
        }
        #endregion
        #region IDisposable Members
 
        public void Dispose()
        {
            ChangeClipboardChain(this.Handle, this.ClipboardViewerNext);
            this.Handle = IntPtr.Zero;
            this.ClipboardViewerNext = IntPtr.Zero;
        }
 
        #endregion
        #region Constructor
        public ClipboardMonitor()
        {
            Process P = Process.GetCurrentProcess();
            this.Handle = P.MainWindowHandle;
            this.ClipboardViewerNext = SetClipboardViewer(this.Handle);
        }
        #endregion
        #region Singleton
        private static ClipboardMonitor Singleton = null;
        public static ClipboardMonitor Instance
        {
            get
            {
                if (Singleton == null)
                    Singleton = new ClipboardMonitor();
                return (Singleton);
            }
        }
 
        #endregion
Pour infos :
SetClipboardViewer retourne 0 (dans le constructeur).

Merci d'avance